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WO2010061590A1 - Appareil de transmission de données, appareil de réception de données et système de communication sans fil - Google Patents

Appareil de transmission de données, appareil de réception de données et système de communication sans fil Download PDF

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Publication number
WO2010061590A1
WO2010061590A1 PCT/JP2009/006350 JP2009006350W WO2010061590A1 WO 2010061590 A1 WO2010061590 A1 WO 2010061590A1 JP 2009006350 W JP2009006350 W JP 2009006350W WO 2010061590 A1 WO2010061590 A1 WO 2010061590A1
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WIPO (PCT)
Prior art keywords
codeword
data
error correction
code
transmitted
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PCT/JP2009/006350
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English (en)
Japanese (ja)
Inventor
松本渉
内田繁
井浦裕貴
久世俊之
吉田英夫
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三菱電機株式会社
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Priority to JP2010540368A priority Critical patent/JP4942846B2/ja
Publication of WO2010061590A1 publication Critical patent/WO2010061590A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0668—Orthogonal systems, e.g. using Alamouti codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end

Definitions

  • the present invention relates to a data transmission apparatus that transmits a plurality of codewords simultaneously using a plurality of antennas, a data reception apparatus that receives a plurality of codewords simultaneously using a plurality of antennas, a data transmission apparatus, and a data reception
  • the present invention relates to a radio communication system comprising devices.
  • a conventional wireless communication system disclosed in the following non-patent document 1 includes the following elements.
  • IDFT is performed by the inverse discrete Fourier transform unit using an inverse discrete Fourier transform unit that performs IDFT (inverse discrete Fourier transform) on the codeword divided by the S / P conversion unit and a plurality of transmission antennas.
  • Multiple input multiple output (MIMO) processing unit that transmits codewords simultaneously (MIMO processing unit up-converts from baseband to high frequency band) Including)
  • a data receiving apparatus and a MIMO processing unit that receives a plurality of codewords simultaneously transmitted from the data transmitting apparatus using a plurality of receiving antennas (the MIMO processing unit performs down-conversion from a high frequency band to a baseband.
  • the MIMO processing unit performs down-conversion from a high frequency band to a baseband.
  • a discrete Fourier transform unit that performs DFT (Discrete Fourier Transform) on the codeword received by the MIMO processing unit.
  • DFT Discrete Fourier Transform
  • the MIMO processing unit of the data transmission apparatus transmits a plurality of codewords simultaneously using a plurality of antennas, the data transfer speed can be improved, but interference occurs between a plurality of communication paths.
  • the MIMO processing unit of the data transmission apparatus transmits a plurality of codewords simultaneously using a plurality of antennas, the data transfer speed can be improved, but interference occurs between a plurality of communication paths.
  • codewords are transmitted through three communication paths and interference occurs between the three communication paths.
  • the channel response matrix H is assumed as follows.
  • h i, j is a channel response from the j-th transmitting antenna to the i-th receiving antenna.
  • a symbol of a code word (a symbol obtained by modulating an error correction code word expressed in binary) transmitted from the MIMO processing unit of the data transmitting apparatus is represented by a symbol S.
  • the symbol S is composed of S 1 , S 2 and S 3 .
  • OFDM modulation is not performed.
  • the MIMO processing unit of the data receiving device receives the codeword symbol using the three receiving antennas when the MIMO processing unit of the data transmitting device transmits the codeword symbol S using the three transmitting antennas. If the received signal is r, the received signal r is expressed as follows.
  • the data transmission device has a mechanism for realizing HARQ-CC (Hybrid Auto-Repeat reQuest-Chase Combining) as a mechanism for automatically transmitting the same symbol S again when the data reception device fails to receive the symbol S.
  • HARQ-CC Hybrid Auto-Repeat reQuest-Chase Combining
  • the data receiving apparatus averages the symbol S with the symbol at the time of initial transmission, thereby degrading noise energy by an average of 3 dB, and succeeding in demodulation and error correction decoding. I try to raise the rate.
  • FIG. 2 (ii) since interference wave components such as h 1,2 h 1,1 * S 2 + h 1,3 h 1,1 * S 3 remain without deterioration, There is little improvement.
  • the data transmission device when the data reception device fails to receive the symbol S, the data transmission device is provided with a mechanism for automatically retransmitting the same symbol S.
  • the energy can be degraded by 3 dB on average.
  • the interference wave component cannot be removed, there is a problem that the success rate of demodulation and error correction decoding cannot be greatly improved.
  • the present invention has been made to solve the above-described problems, and is a data transmission device capable of greatly improving the success rate of demodulation and error correction decoding by suppressing not only noise but also interference wave components,
  • An object is to obtain a data receiving apparatus and a wireless communication system.
  • the codeword transmitting means of the data transmitting apparatus makes a specific modification to the Alamouti code and the Alamouti code.
  • the transmitted codeword is transformed and transmitted using the performed code, and the data is reproduced using the modified codeword in the error correction decoding means of the data receiving apparatus.
  • the code word transmission means of the data transmitting apparatus performs the Alamouti code and a code obtained by performing a specific modification on the Alamouti code. Is used to reconstruct the transmitted codeword and transmit it, and the error correction decoding means of the data receiving device is configured to reproduce the data using the modified codeword.
  • FIG. 1 is a block diagram showing a wireless communication system according to Embodiment 1 of the present invention.
  • a data transmission device 1 is a transmitter that simultaneously transmits a plurality of codewords using a plurality of antennas.
  • the data receiving apparatus 2 is a receiver that receives a plurality of codewords simultaneously using a plurality of antennas.
  • the error correction encoding unit 11 of the data transmission apparatus 1 performs a process of generating an error correction code on the transmission target data to generate a code word.
  • the error correction encoding unit 11 includes an error correction encoding means.
  • the modulation unit 12 of the data transmission device 1 performs a process of modulating the codeword generated by the error correction coding unit 11 into QPSK or the like.
  • a modulation means is comprised by providing the modulation
  • the S / P conversion unit 13 of the data transmission apparatus 1 performs a process of serial-parallel conversion of the codeword modulated by the modulation unit 12 and dividing the codeword.
  • the inverse discrete Fourier transform units 14a, 14b, 14c, and 14d of the data transmission apparatus 1 perform IDFT (Inverse Discrete Fourier Transform) on the codeword divided by the S / P conversion unit 13.
  • the MIMO processing unit 15 of the data transmission device 1 performs a process of simultaneously transmitting the codeword subjected to the IDFT by the inverse discrete Fourier transform unit 13 using the transmission antennas 16a, 16b, 16c, and 16d. However, the MIMO processing unit 15 also performs up-conversion from the baseband to the high frequency band. Further, the MIMO processing unit 15 has a mechanism for realizing HARQ-CC (Hybrid Auto-Repeat reQuest-Chase Combining), and the error correction decoding of the codeword in the error correction decoding unit 26 of the data receiving apparatus 2 has failed. In this case, a process is performed in which the transmitted codeword is transformed and transmitted according to a predetermined rule.
  • the codeword transmission means is configured by including at least the S / P conversion unit 13, the inverse discrete Fourier transform units 14a, 14b, 14c, and 14d, and the MIMO processing unit 15.
  • the MIMO processing unit 22 of the data receiving apparatus 2 performs a process of receiving a plurality of codewords transmitted simultaneously from the data transmitting apparatus 1 by using the receiving antennas 21a, 21b, 21c, and 21d. However, the MIMO processing unit 22 also performs down-conversion from the high frequency band to the baseband. In addition, a codeword receiving means is comprised by providing the MIMO process part 22 at least.
  • the discrete Fourier transform units 23a, 23b, 23c, and 23d of the data receiving apparatus 2 perform DFT (Discrete Fourier Transform) on the codeword received by the MIMO processing unit 22.
  • the P / S conversion unit 24 of the data reception device 2 performs a parallel-serial conversion on the codeword on which the DFT has been performed by the discrete Fourier transform units 23a, 23b, 23c, and 23d, and integrates a plurality of codewords.
  • the demodulator 25 of the data receiver 2 performs a process of demodulating the codeword integrated by the P / S converter 24.
  • the demodulating means is configured by including at least the discrete Fourier transform units 23a, 23b, 23c, and 23d, the P / S conversion unit 24, and the demodulation unit 25.
  • the error correction decoding unit 26 of the data receiving device 2 performs error correction decoding on the codeword demodulated by the demodulation unit 25 and reproduces the data. Further, when a codeword modified by HARQ-CC is transmitted from the data transmission apparatus 1, the error correction decoding unit 26 performs a process of reproducing data using the modified codeword. Note that at least the error correction decoding unit 26 includes an error correction decoding unit.
  • the error correction encoding unit 11 of the data transmission apparatus 1 When receiving the data to be transmitted, the error correction encoding unit 11 of the data transmission apparatus 1 performs error correction encoding on the data to generate a code word.
  • the modulation unit 12 of the data transmission apparatus 1 modulates the code word into QPSK or the like.
  • the S / P conversion unit 13 of the data transmission device 1 serial-parallel converts the code word and divides the code word.
  • the code word is divided into four, and the four divided code words are output to the inverse discrete Fourier transform units 14a, 14b, 14c, and 14d.
  • the inverse discrete Fourier transform units 14a, 14b, 14c, and 14d of the data transmission apparatus 1 perform IDFT on the codeword divided by the S / P conversion unit 13.
  • the MIMO processing unit 15 of the data transmission device 1 transmits simultaneously the codeword subjected to IDFT by the inverse discrete Fourier transform unit 13 using the transmission antennas 16a, 16b, 16c, and 16d.
  • the MIMO processing unit 22 of the data reception apparatus 2 uses a plurality of codewords transmitted from the data transmission apparatus 1 using the reception antennas 21a, 21b, 21c, and 21d. Receive.
  • the discrete Fourier transform units 23a, 23b, 23c, and 23d of the data reception device 2 perform DFT on the codeword received by the MIMO processing unit 22 in the case of OFDM modulation.
  • the P / S conversion unit 24 of the data receiving apparatus 2 performs parallel-serial conversion on the codeword subjected to DFT by the discrete Fourier transform units 23a, 23b, 23c, and 23d, and integrates a plurality of codewords.
  • the demodulator 25 of the data receiving device 2 demodulates the integrated code words.
  • the error correction decoding unit 26 of the data receiving device 2 performs error correction decoding on the code word and reproduces the data.
  • the MIMO processing unit 15 of the data transmission device 1 transmits a NAK (Negative AcKnowledgements) signal to the transmitter side when the error correction decoding of the codeword in the error correction decoding unit 26 of the data reception device 2 fails. Detects reception failure of the receiver by a predetermined process, The transmitted codeword is transformed and transmitted according to a predetermined processing rule. When the codeword modified from the data transmission device 1 is transmitted by HARQ-CC, the error correction decoding unit 26 of the data reception device 2 reproduces data using the modified codeword.
  • NAK Negative AcKnowledgements
  • the channel response matrix H is assumed as follows.
  • h i, j is a channel response from the j-th transmitting antenna to the i-th receiving antenna.
  • a symbol of a code word (a symbol obtained by modulating an error correction code word expressed in binary) transmitted from the MIMO processing unit 15 of the data transmitting apparatus 1 is represented by S.
  • S a symbol of a code word (a symbol obtained by modulating an error correction code word expressed in binary) transmitted from the MIMO processing unit 15 of the data transmitting apparatus 1 is represented by S.
  • OFDM modulation is not performed.
  • the MIMO processing unit 15 of the data transmission device 1 transmits the code word symbol S using the four transmission antennas 16a, 16b, 16c, and 16d
  • the MIMO processing unit 22 of the data reception device 2 receives the four reception antennas 21a.
  • 21b, 21c, and 21d are used to receive codeword symbols. If the received signal is r, the received signal r is expressed as follows.
  • the MIMO processing unit 15 of the data transmission device 1 is configured such that the symbol S (1) of the code word transmitted for the first time (at the first transmission ) is not normally decoded by the error correction decoding unit 26 of the data reception device 2.
  • Alamouti symbol S (1) using a code was specified deformation Alamouti code and its Alamouti code to deform the symbols S (1) into symbols S (2), Similarly, the symbol S (1) The symbol S (1) is transformed into symbols S (3) and S (4) using a code and a code obtained by performing specific modification on the Alamouti code.
  • the Alamouti code is, for example, the following formula (A-1) for 2 ⁇ 2 MIMO, and the determinant (the left side of the formula (A-2)) is the right side of the formula (A-2). It has the following characteristics. That is, there is a characteristic that the result of the determinant of the matrix expressed in complex numbers is a real number.
  • a code obtained by modifying the symbol of the initial transmission so that the determinant composed of the symbols at the initial transmission and the retransmission has the characteristic of the equation (A-2) is used.
  • the first row and the first column and the second row and the second column of the Alamouti code are made complex conjugate as shown in the following formula (A-3), and minus is added.
  • the condition of the Alamouti code is satisfied. That is, the condition of the Alamouti code that the result of the determinant of the matrix expressed by a complex number is a real number is satisfied.
  • the characteristic of the matrix (formula (A-7)) obtained by transforming the symbol S (1) into the symbols S (2) , S (3) , S (4) is, for example, an Alamouti code as a partial matrix, A specific modification is performed on a set of multiple sub-matrices and a part of the sub-matrices. It is characterized by being located in a row.
  • the matrix A is arranged in the first row
  • the matrix B and the matrix B ′ are arranged in the second row
  • the same submatrix is located in the same row
  • a different submatrix and the part subjected to the specific conversion thereof The matrix is located in the same row.
  • the MIMO processing unit 15 of the data transmission device 1 generates the expression (A-7) as described above, and generates the symbols S (2) , S (3) , S (4) based on this matrix. Then, symbols S ( 2) , S (3) and S (4) are transmitted using the four transmission antennas 16a, 16b, 16c and 16d following the symbol S (1) .
  • the MIMO processing unit 22 of the data receiving device 2 is configured so that the MIMO processing unit 15 of the data transmitting device 1 uses the sequence S (1,2,3 ) of symbols S (1) , S (2) , S (3) , S (4). , 4) is transmitted, the symbol series r (1, 2, 3, 4) is received using the four receiving antennas 21a, 21b, 21c, 21d.
  • This series r (1,2,3,4) is expressed as follows.
  • equation (5) is organized as equation (6-1), and by calculating equation (6-1), S 1 , S 2 , S 3 , to retrieve the S 4.
  • S 1 is as follows. However, in formula (6-1), it is defined as in formula (6-1A).
  • Equation (6-5) is a noise component.
  • the interference component is canceled by this encoding, and only the noise component remains.
  • Expression (3) is further expressed as including Expression (7) including a precoder.
  • r HWS + n (7)
  • W is a 4 ⁇ 4 precoder.
  • equation (9) is obtained.
  • W the receiving antenna for the symbol can be switched, and antenna hopping can be realized. Therefore, there is an effect that diversity gain can be obtained.
  • Antenna hopping can be realized by switching and using. Also, by providing many types of W, antenna switching close to random can be realized, and higher diversity gain can be obtained.
  • the error correction decoding unit 26 of the data receiving apparatus 2 sets the interference wave to zero, detects the desired waves S 1, S 2, S 3, and S 4 , and obtains an average of noise components. it can.
  • the degradation component is only noise, and the detection probability is improved. Also, higher diversity gain can be obtained by performing antenna hopping.
  • the MIMO processing unit 15 of the data transmitting device 1 performs the predetermined processing. Since the transmitted codeword is modified and transmitted according to the above rule, and the error correction decoding unit 26 of the data receiving device 2 is configured to reproduce the data using the modified codeword, not only noise Thus, the interference wave component can be suppressed and the success rate of demodulation and error correction decoding can be greatly improved.
  • the transmitted codeword is transformed and transmitted, and the error correction of the data receiving apparatus 2 is performed. Since the decoding unit 26 is configured to reproduce data using the modified codeword, it is possible to greatly improve the success rate of demodulation and error correction decoding by suppressing not only noise but also interference wave components. There is an effect that can be done.
  • the transmitted codeword is modified and transmitted according to the number of transmission antennas and the number of reception antennas, for example, the number of transmission antennas is four, and reception antennas According to the number of four, since it is configured to transmit the code after four times in total, there is an effect that the diversity effect can be improved.
  • the reception antenna for the symbol can be switched by including the precoder in the received signal r and switching the precoder, thereby realizing antenna hopping. Thereby, there is an effect that diversity gain can be obtained.
  • transmission symbols S (1) , S (2) , S (3) , S (4) as in the following equation (12 ) are transmitted. Also in this case, decoding can be performed in the same procedure as in the case of the equation (4).
  • Embodiment 2 FIG. In the first embodiment, the case of the retransmission scheme has been shown, but it is also possible to apply to STBC (Space Time Block Code) and SFBC (Space Frequency Block Code) in order to obtain diversity gain in one transmission. .
  • STBC Space Time Block Code
  • SFBC Space Frequency Block Code
  • FIG. 1 A configuration diagram showing a radio communication system according to the second embodiment of the present invention is shown in FIG. 1 similarly to the first embodiment.
  • the MIMO processing unit 15 is configured to be able to encode a transmission symbol based on a predetermined matrix. Further, the encoded MIMO processing unit 15 may not include a mechanism for realizing HARQ-CC.
  • FIG. 1 for example, when four transmission antennas, four reception antennas, and transmission symbols are encoded based on the matrix of equation (A-7), equation (13) is obtained.
  • each row corresponds to each antenna, and each column corresponds to a different time. Different times mean different OFDM symbols, for example.
  • each row corresponds to each antenna, and each column corresponds to a different frequency. Different frequencies mean different subcarriers in an OFDM symbol, for example. W may be used by switching every 4 symbols.
  • the above equation (13) corresponds to the matrix of the above equation (A-7), and can be expressed by the same reception result as the equation (5). Therefore, the equation (6-1) Thus, decoding can be performed using equation (6-4), and the same effect as in the first embodiment can be obtained.
  • the MIMO processing unit of the data transmission device 1 is based on the Alamouti code and a matrix obtained by using a code (matrix) obtained by performing a specific modification on the Alamouti code.
  • 15 transmits the code word
  • the error correction decoding unit 26 of the data receiving apparatus 2 is configured to reproduce the data using the code word, so that not only the noise but also the interference wave component is suppressed and demodulated.
  • the success rate of error correction decoding can be greatly improved.
  • the above equation (14) corresponds to the matrix of the above equation (A-9), and has the same effect as the first embodiment.
  • the data receiving apparatus since the data receiving apparatus according to the present invention reproduces data using the modified codeword when error correction decoding fails, a data receiving apparatus that simultaneously receives a plurality of codewords, and It is suitable for use in a data transmission apparatus, a wireless communication system, etc. corresponding to this.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Radio Transmission System (AREA)

Abstract

Selon l'invention, si un décodage de correction d'erreurs de mots de code mis en œuvre par un moyen de décodage de correction d'erreurs d'un appareil de réception de données est un échec, un moyen de transmission de mots de code d'un appareil de transmission de données utilise un code d'Alamouti et une version modifiée du code d'Alamouti pour modifier le mot de code transmis et transmettre la version modifiée du mot de code transmis, et le moyen de décodage de correction d'erreurs de l'appareil de réception de données utilise la version modifiée du mot de code transmis pour reproduire les données.
PCT/JP2009/006350 2008-11-28 2009-11-25 Appareil de transmission de données, appareil de réception de données et système de communication sans fil WO2010061590A1 (fr)

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JP2012004765A (ja) * 2010-06-16 2012-01-05 Panasonic Electric Works Co Ltd 送受信機
WO2017217024A1 (fr) * 2016-06-14 2017-12-21 株式会社Ｎｔｔドコモ Système de communication
RU2799577C1 (ru) * 2023-03-01 2023-07-06 Владимир Анатольевич Цимбал Способ передачи данных по пространственно-разнесенным радиопередатчикам

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012004765A (ja) * 2010-06-16 2012-01-05 Panasonic Electric Works Co Ltd 送受信機
WO2017217024A1 (fr) * 2016-06-14 2017-12-21 株式会社Ｎｔｔドコモ Système de communication
JPWO2017217024A1 (ja) * 2016-06-14 2019-05-16 株式会社Ｎｔｔドコモ 通信システム
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JP7038657B2 (ja) 2016-06-14 2022-03-18 株式会社Ｎｔｔドコモ 通信システム
RU2799577C1 (ru) * 2023-03-01 2023-07-06 Владимир Анатольевич Цимбал Способ передачи данных по пространственно-разнесенным радиопередатчикам

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